Medium severity · published May 22, 2025
CVE-2025-47779
Asterisk is an open-source private branch exchange (PBX)
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abuse of this security issue allows authenticated attackers to send fake chat messages can be spoofed to appear to come from trusted entities. Even administrators who follow Security best practices and Security Considerations can be impacted. Therefore, abuse can lead to spam and enable social engineering, phishing and similar attacks. Versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk fix the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Sangoma
before 18.26.2; 20.0.0 before 20.14.1; 21.0.0 before 21.9.1; 22.0.0 before 22.4.1 · source: NVD
CA
Certified Asterisk · Sangoma
before 18.9; 18.9; 18.9; 18.9; 18.9; 18.9; +18 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47779
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-47779
Product
https://github.com/asterisk/asterisk/blob/master/configs/samples/pjsip.conf.sample
Exploit
https://github.com/asterisk/asterisk/security/advisories/GHSA-2grh-7mhv-fcfw
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/06/msg00003.html
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